New criminology data have been reported by K. Soothill and co-authors.

"The interrelationships between serious types of crime have been neglected. Focusing on those convicted of arson (n = 45,915), blackmail (n = 5,774), kidnapping (n = 7,291) and threats to kill (n = 9,816) in U.K. and Wales (1979-2001), we examine the specialization and sequencing of these crimes in relation to the risk of subsequent homicide," scientists in Lancaster, the United Kingdom report.